Sorry SSK but it doesn't have to have a date to make PO1.
If the year and mintmark can be determined by other means it doesn't have to have the date. A 90% silver Kennedy should be distinguishable by weight, or specific gravity test if necessary. So now it's down to figuring out whether there's even a tiny blob where the D should be and poof: you have your attribution.
-----Burton
50+ year / Life / Emeritus
ANA member (joined 12/1/1973)
Life member: Numismatics International, CONECA
Member: TNA, FtWCC, NETCC, EveryCountry (online) coin club
Owned by three cats and a wife of 40+ years (joined 1983)
Author: 3rd Edition of the Sample Slabs book,
https://www.sampleslabs.info/